I have a DIY RIMS tube, made out of tri clamp parts, with a thermowell near the return side of the tube. I can not get the the pid to autotune. It is a Cal 3300, not an Auber, but I have seen a few references to issues also tuning to an Auber. If this is a universal issue, what has everyone done? Did you find a way to make it work or just set it manually?